1 files changed, 45 insertions, 0 deletions
diff --git a/browser/components/newtab/test/browser/browser_newtab_towindow.js b/browser/components/newtab/test/browser/browser_newtab_towindow.js
new file mode 100644
index 0000000000..d0a49e63f0
--- /dev/null
+++ b/browser/components/newtab/test/browser/browser_newtab_towindow.js
@@ -0,0 +1,45 @@
+// This test simulates opening the newtab page and moving it to a new window.
+// Links in the page should still work.
+add_task(async function test_newtab_to_window() {
+  await setTestTopSites();
+
+  let tab = await BrowserTestUtils.openNewForegroundTab(
+    gBrowser,
+    "about:newtab",
+    false
+  );
+
+  let swappedPromise = BrowserTestUtils.waitForEvent(
+    tab.linkedBrowser,
+    "SwapDocShells"
+  );
+  let newWindow = gBrowser.replaceTabWithWindow(tab);
+  await swappedPromise;
+
+  is(
+    newWindow.gBrowser.selectedBrowser.currentURI.spec,
+    "about:newtab",
+    "about:newtab moved to window"
+  );
+
+  let tabPromise = BrowserTestUtils.waitForNewTab(
+    newWindow.gBrowser,
+    "https://example.com/",
+    true
+  );
+
+  await BrowserTestUtils.synthesizeMouse(
+    `.top-sites a`,
+    2,
+    2,
+    { accelKey: true },
+    newWindow.gBrowser.selectedBrowser
+  );
+
+  await tabPromise;
+
+  is(newWindow.gBrowser.tabs.length, 2, "second page is opened");
+
+  BrowserTestUtils.removeTab(newWindow.gBrowser.selectedTab);
+  await BrowserTestUtils.closeWindow(newWindow);
+});